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[mirror_ubuntu-artful-kernel.git] / net / iucv / af_iucv.c
1 /*
2 * IUCV protocol stack for Linux on zSeries
3 *
4 * Copyright IBM Corp. 2006, 2009
5 *
6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
8 * PM functions:
9 * Ursula Braun <ursula.braun@de.ibm.com>
10 */
11
12 #define KMSG_COMPONENT "af_iucv"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/list.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/sched/signal.h>
21 #include <linux/slab.h>
22 #include <linux/skbuff.h>
23 #include <linux/init.h>
24 #include <linux/poll.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <asm/ebcdic.h>
28 #include <asm/cpcmd.h>
29 #include <linux/kmod.h>
30
31 #include <net/iucv/af_iucv.h>
32
33 #define VERSION "1.2"
34
35 static char iucv_userid[80];
36
37 static const struct proto_ops iucv_sock_ops;
38
39 static struct proto iucv_proto = {
40 .name = "AF_IUCV",
41 .owner = THIS_MODULE,
42 .obj_size = sizeof(struct iucv_sock),
43 };
44
45 static struct iucv_interface *pr_iucv;
46
47 /* special AF_IUCV IPRM messages */
48 static const u8 iprm_shutdown[8] =
49 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
50
51 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
52
53 #define __iucv_sock_wait(sk, condition, timeo, ret) \
54 do { \
55 DEFINE_WAIT(__wait); \
56 long __timeo = timeo; \
57 ret = 0; \
58 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
59 while (!(condition)) { \
60 if (!__timeo) { \
61 ret = -EAGAIN; \
62 break; \
63 } \
64 if (signal_pending(current)) { \
65 ret = sock_intr_errno(__timeo); \
66 break; \
67 } \
68 release_sock(sk); \
69 __timeo = schedule_timeout(__timeo); \
70 lock_sock(sk); \
71 ret = sock_error(sk); \
72 if (ret) \
73 break; \
74 } \
75 finish_wait(sk_sleep(sk), &__wait); \
76 } while (0)
77
78 #define iucv_sock_wait(sk, condition, timeo) \
79 ({ \
80 int __ret = 0; \
81 if (!(condition)) \
82 __iucv_sock_wait(sk, condition, timeo, __ret); \
83 __ret; \
84 })
85
86 static void iucv_sock_kill(struct sock *sk);
87 static void iucv_sock_close(struct sock *sk);
88 static void iucv_sever_path(struct sock *, int);
89
90 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
91 struct packet_type *pt, struct net_device *orig_dev);
92 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
93 struct sk_buff *skb, u8 flags);
94 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
95
96 /* Call Back functions */
97 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
98 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
99 static void iucv_callback_connack(struct iucv_path *, u8 *);
100 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
101 static void iucv_callback_connrej(struct iucv_path *, u8 *);
102 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
103
104 static struct iucv_sock_list iucv_sk_list = {
105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
106 .autobind_name = ATOMIC_INIT(0)
107 };
108
109 static struct iucv_handler af_iucv_handler = {
110 .path_pending = iucv_callback_connreq,
111 .path_complete = iucv_callback_connack,
112 .path_severed = iucv_callback_connrej,
113 .message_pending = iucv_callback_rx,
114 .message_complete = iucv_callback_txdone,
115 .path_quiesced = iucv_callback_shutdown,
116 };
117
118 static inline void high_nmcpy(unsigned char *dst, char *src)
119 {
120 memcpy(dst, src, 8);
121 }
122
123 static inline void low_nmcpy(unsigned char *dst, char *src)
124 {
125 memcpy(&dst[8], src, 8);
126 }
127
128 static int afiucv_pm_prepare(struct device *dev)
129 {
130 #ifdef CONFIG_PM_DEBUG
131 printk(KERN_WARNING "afiucv_pm_prepare\n");
132 #endif
133 return 0;
134 }
135
136 static void afiucv_pm_complete(struct device *dev)
137 {
138 #ifdef CONFIG_PM_DEBUG
139 printk(KERN_WARNING "afiucv_pm_complete\n");
140 #endif
141 }
142
143 /**
144 * afiucv_pm_freeze() - Freeze PM callback
145 * @dev: AFIUCV dummy device
146 *
147 * Sever all established IUCV communication pathes
148 */
149 static int afiucv_pm_freeze(struct device *dev)
150 {
151 struct iucv_sock *iucv;
152 struct sock *sk;
153 int err = 0;
154
155 #ifdef CONFIG_PM_DEBUG
156 printk(KERN_WARNING "afiucv_pm_freeze\n");
157 #endif
158 read_lock(&iucv_sk_list.lock);
159 sk_for_each(sk, &iucv_sk_list.head) {
160 iucv = iucv_sk(sk);
161 switch (sk->sk_state) {
162 case IUCV_DISCONN:
163 case IUCV_CLOSING:
164 case IUCV_CONNECTED:
165 iucv_sever_path(sk, 0);
166 break;
167 case IUCV_OPEN:
168 case IUCV_BOUND:
169 case IUCV_LISTEN:
170 case IUCV_CLOSED:
171 default:
172 break;
173 }
174 skb_queue_purge(&iucv->send_skb_q);
175 skb_queue_purge(&iucv->backlog_skb_q);
176 }
177 read_unlock(&iucv_sk_list.lock);
178 return err;
179 }
180
181 /**
182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
183 * @dev: AFIUCV dummy device
184 *
185 * socket clean up after freeze
186 */
187 static int afiucv_pm_restore_thaw(struct device *dev)
188 {
189 struct sock *sk;
190
191 #ifdef CONFIG_PM_DEBUG
192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
193 #endif
194 read_lock(&iucv_sk_list.lock);
195 sk_for_each(sk, &iucv_sk_list.head) {
196 switch (sk->sk_state) {
197 case IUCV_CONNECTED:
198 sk->sk_err = EPIPE;
199 sk->sk_state = IUCV_DISCONN;
200 sk->sk_state_change(sk);
201 break;
202 case IUCV_DISCONN:
203 case IUCV_CLOSING:
204 case IUCV_LISTEN:
205 case IUCV_BOUND:
206 case IUCV_OPEN:
207 default:
208 break;
209 }
210 }
211 read_unlock(&iucv_sk_list.lock);
212 return 0;
213 }
214
215 static const struct dev_pm_ops afiucv_pm_ops = {
216 .prepare = afiucv_pm_prepare,
217 .complete = afiucv_pm_complete,
218 .freeze = afiucv_pm_freeze,
219 .thaw = afiucv_pm_restore_thaw,
220 .restore = afiucv_pm_restore_thaw,
221 };
222
223 static struct device_driver af_iucv_driver = {
224 .owner = THIS_MODULE,
225 .name = "afiucv",
226 .bus = NULL,
227 .pm = &afiucv_pm_ops,
228 };
229
230 /* dummy device used as trigger for PM functions */
231 static struct device *af_iucv_dev;
232
233 /**
234 * iucv_msg_length() - Returns the length of an iucv message.
235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
236 *
237 * The function returns the length of the specified iucv message @msg of data
238 * stored in a buffer and of data stored in the parameter list (PRMDATA).
239 *
240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
241 * data:
242 * PRMDATA[0..6] socket data (max 7 bytes);
243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
244 *
245 * The socket data length is computed by subtracting the socket data length
246 * value from 0xFF.
247 * If the socket data len is greater 7, then PRMDATA can be used for special
248 * notifications (see iucv_sock_shutdown); and further,
249 * if the socket data len is > 7, the function returns 8.
250 *
251 * Use this function to allocate socket buffers to store iucv message data.
252 */
253 static inline size_t iucv_msg_length(struct iucv_message *msg)
254 {
255 size_t datalen;
256
257 if (msg->flags & IUCV_IPRMDATA) {
258 datalen = 0xff - msg->rmmsg[7];
259 return (datalen < 8) ? datalen : 8;
260 }
261 return msg->length;
262 }
263
264 /**
265 * iucv_sock_in_state() - check for specific states
266 * @sk: sock structure
267 * @state: first iucv sk state
268 * @state: second iucv sk state
269 *
270 * Returns true if the socket in either in the first or second state.
271 */
272 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
273 {
274 return (sk->sk_state == state || sk->sk_state == state2);
275 }
276
277 /**
278 * iucv_below_msglim() - function to check if messages can be sent
279 * @sk: sock structure
280 *
281 * Returns true if the send queue length is lower than the message limit.
282 * Always returns true if the socket is not connected (no iucv path for
283 * checking the message limit).
284 */
285 static inline int iucv_below_msglim(struct sock *sk)
286 {
287 struct iucv_sock *iucv = iucv_sk(sk);
288
289 if (sk->sk_state != IUCV_CONNECTED)
290 return 1;
291 if (iucv->transport == AF_IUCV_TRANS_IUCV)
292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
293 else
294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
295 (atomic_read(&iucv->pendings) <= 0));
296 }
297
298 /**
299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
300 */
301 static void iucv_sock_wake_msglim(struct sock *sk)
302 {
303 struct socket_wq *wq;
304
305 rcu_read_lock();
306 wq = rcu_dereference(sk->sk_wq);
307 if (skwq_has_sleeper(wq))
308 wake_up_interruptible_all(&wq->wait);
309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
310 rcu_read_unlock();
311 }
312
313 /**
314 * afiucv_hs_send() - send a message through HiperSockets transport
315 */
316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
317 struct sk_buff *skb, u8 flags)
318 {
319 struct iucv_sock *iucv = iucv_sk(sock);
320 struct af_iucv_trans_hdr *phs_hdr;
321 struct sk_buff *nskb;
322 int err, confirm_recv = 0;
323
324 memset(skb->head, 0, ETH_HLEN);
325 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
326 sizeof(struct af_iucv_trans_hdr));
327 skb_reset_mac_header(skb);
328 skb_reset_network_header(skb);
329 skb_push(skb, ETH_HLEN);
330 skb_reset_mac_header(skb);
331 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
332
333 phs_hdr->magic = ETH_P_AF_IUCV;
334 phs_hdr->version = 1;
335 phs_hdr->flags = flags;
336 if (flags == AF_IUCV_FLAG_SYN)
337 phs_hdr->window = iucv->msglimit;
338 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
339 confirm_recv = atomic_read(&iucv->msg_recv);
340 phs_hdr->window = confirm_recv;
341 if (confirm_recv)
342 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
343 }
344 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
345 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
346 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
347 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
348 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
349 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
350 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
351 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
352 if (imsg)
353 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
354
355 skb->dev = iucv->hs_dev;
356 if (!skb->dev)
357 return -ENODEV;
358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
359 return -ENETDOWN;
360 if (skb->len > skb->dev->mtu) {
361 if (sock->sk_type == SOCK_SEQPACKET)
362 return -EMSGSIZE;
363 else
364 skb_trim(skb, skb->dev->mtu);
365 }
366 skb->protocol = ETH_P_AF_IUCV;
367 nskb = skb_clone(skb, GFP_ATOMIC);
368 if (!nskb)
369 return -ENOMEM;
370 skb_queue_tail(&iucv->send_skb_q, nskb);
371 err = dev_queue_xmit(skb);
372 if (net_xmit_eval(err)) {
373 skb_unlink(nskb, &iucv->send_skb_q);
374 kfree_skb(nskb);
375 } else {
376 atomic_sub(confirm_recv, &iucv->msg_recv);
377 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
378 }
379 return net_xmit_eval(err);
380 }
381
382 static struct sock *__iucv_get_sock_by_name(char *nm)
383 {
384 struct sock *sk;
385
386 sk_for_each(sk, &iucv_sk_list.head)
387 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
388 return sk;
389
390 return NULL;
391 }
392
393 static void iucv_sock_destruct(struct sock *sk)
394 {
395 skb_queue_purge(&sk->sk_receive_queue);
396 skb_queue_purge(&sk->sk_error_queue);
397
398 sk_mem_reclaim(sk);
399
400 if (!sock_flag(sk, SOCK_DEAD)) {
401 pr_err("Attempt to release alive iucv socket %p\n", sk);
402 return;
403 }
404
405 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
406 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
407 WARN_ON(sk->sk_wmem_queued);
408 WARN_ON(sk->sk_forward_alloc);
409 }
410
411 /* Cleanup Listen */
412 static void iucv_sock_cleanup_listen(struct sock *parent)
413 {
414 struct sock *sk;
415
416 /* Close non-accepted connections */
417 while ((sk = iucv_accept_dequeue(parent, NULL))) {
418 iucv_sock_close(sk);
419 iucv_sock_kill(sk);
420 }
421
422 parent->sk_state = IUCV_CLOSED;
423 }
424
425 /* Kill socket (only if zapped and orphaned) */
426 static void iucv_sock_kill(struct sock *sk)
427 {
428 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
429 return;
430
431 iucv_sock_unlink(&iucv_sk_list, sk);
432 sock_set_flag(sk, SOCK_DEAD);
433 sock_put(sk);
434 }
435
436 /* Terminate an IUCV path */
437 static void iucv_sever_path(struct sock *sk, int with_user_data)
438 {
439 unsigned char user_data[16];
440 struct iucv_sock *iucv = iucv_sk(sk);
441 struct iucv_path *path = iucv->path;
442
443 if (iucv->path) {
444 iucv->path = NULL;
445 if (with_user_data) {
446 low_nmcpy(user_data, iucv->src_name);
447 high_nmcpy(user_data, iucv->dst_name);
448 ASCEBC(user_data, sizeof(user_data));
449 pr_iucv->path_sever(path, user_data);
450 } else
451 pr_iucv->path_sever(path, NULL);
452 iucv_path_free(path);
453 }
454 }
455
456 /* Send controlling flags through an IUCV socket for HIPER transport */
457 static int iucv_send_ctrl(struct sock *sk, u8 flags)
458 {
459 int err = 0;
460 int blen;
461 struct sk_buff *skb;
462 u8 shutdown = 0;
463
464 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
465 if (sk->sk_shutdown & SEND_SHUTDOWN) {
466 /* controlling flags should be sent anyway */
467 shutdown = sk->sk_shutdown;
468 sk->sk_shutdown &= RCV_SHUTDOWN;
469 }
470 skb = sock_alloc_send_skb(sk, blen, 1, &err);
471 if (skb) {
472 skb_reserve(skb, blen);
473 err = afiucv_hs_send(NULL, sk, skb, flags);
474 }
475 if (shutdown)
476 sk->sk_shutdown = shutdown;
477 return err;
478 }
479
480 /* Close an IUCV socket */
481 static void iucv_sock_close(struct sock *sk)
482 {
483 struct iucv_sock *iucv = iucv_sk(sk);
484 unsigned long timeo;
485 int err = 0;
486
487 lock_sock(sk);
488
489 switch (sk->sk_state) {
490 case IUCV_LISTEN:
491 iucv_sock_cleanup_listen(sk);
492 break;
493
494 case IUCV_CONNECTED:
495 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
496 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
497 sk->sk_state = IUCV_DISCONN;
498 sk->sk_state_change(sk);
499 }
500 case IUCV_DISCONN: /* fall through */
501 sk->sk_state = IUCV_CLOSING;
502 sk->sk_state_change(sk);
503
504 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
505 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
506 timeo = sk->sk_lingertime;
507 else
508 timeo = IUCV_DISCONN_TIMEOUT;
509 iucv_sock_wait(sk,
510 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
511 timeo);
512 }
513
514 case IUCV_CLOSING: /* fall through */
515 sk->sk_state = IUCV_CLOSED;
516 sk->sk_state_change(sk);
517
518 sk->sk_err = ECONNRESET;
519 sk->sk_state_change(sk);
520
521 skb_queue_purge(&iucv->send_skb_q);
522 skb_queue_purge(&iucv->backlog_skb_q);
523
524 default: /* fall through */
525 iucv_sever_path(sk, 1);
526 }
527
528 if (iucv->hs_dev) {
529 dev_put(iucv->hs_dev);
530 iucv->hs_dev = NULL;
531 sk->sk_bound_dev_if = 0;
532 }
533
534 /* mark socket for deletion by iucv_sock_kill() */
535 sock_set_flag(sk, SOCK_ZAPPED);
536
537 release_sock(sk);
538 }
539
540 static void iucv_sock_init(struct sock *sk, struct sock *parent)
541 {
542 if (parent) {
543 sk->sk_type = parent->sk_type;
544 security_sk_clone(parent, sk);
545 }
546 }
547
548 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
549 {
550 struct sock *sk;
551 struct iucv_sock *iucv;
552
553 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
554 if (!sk)
555 return NULL;
556 iucv = iucv_sk(sk);
557
558 sock_init_data(sock, sk);
559 INIT_LIST_HEAD(&iucv->accept_q);
560 spin_lock_init(&iucv->accept_q_lock);
561 skb_queue_head_init(&iucv->send_skb_q);
562 INIT_LIST_HEAD(&iucv->message_q.list);
563 spin_lock_init(&iucv->message_q.lock);
564 skb_queue_head_init(&iucv->backlog_skb_q);
565 iucv->send_tag = 0;
566 atomic_set(&iucv->pendings, 0);
567 iucv->flags = 0;
568 iucv->msglimit = 0;
569 atomic_set(&iucv->msg_sent, 0);
570 atomic_set(&iucv->msg_recv, 0);
571 iucv->path = NULL;
572 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
573 memset(&iucv->src_user_id , 0, 32);
574 if (pr_iucv)
575 iucv->transport = AF_IUCV_TRANS_IUCV;
576 else
577 iucv->transport = AF_IUCV_TRANS_HIPER;
578
579 sk->sk_destruct = iucv_sock_destruct;
580 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
581 sk->sk_allocation = GFP_DMA;
582
583 sock_reset_flag(sk, SOCK_ZAPPED);
584
585 sk->sk_protocol = proto;
586 sk->sk_state = IUCV_OPEN;
587
588 iucv_sock_link(&iucv_sk_list, sk);
589 return sk;
590 }
591
592 /* Create an IUCV socket */
593 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
594 int kern)
595 {
596 struct sock *sk;
597
598 if (protocol && protocol != PF_IUCV)
599 return -EPROTONOSUPPORT;
600
601 sock->state = SS_UNCONNECTED;
602
603 switch (sock->type) {
604 case SOCK_STREAM:
605 sock->ops = &iucv_sock_ops;
606 break;
607 case SOCK_SEQPACKET:
608 /* currently, proto ops can handle both sk types */
609 sock->ops = &iucv_sock_ops;
610 break;
611 default:
612 return -ESOCKTNOSUPPORT;
613 }
614
615 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
616 if (!sk)
617 return -ENOMEM;
618
619 iucv_sock_init(sk, NULL);
620
621 return 0;
622 }
623
624 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
625 {
626 write_lock_bh(&l->lock);
627 sk_add_node(sk, &l->head);
628 write_unlock_bh(&l->lock);
629 }
630
631 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
632 {
633 write_lock_bh(&l->lock);
634 sk_del_node_init(sk);
635 write_unlock_bh(&l->lock);
636 }
637
638 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
639 {
640 unsigned long flags;
641 struct iucv_sock *par = iucv_sk(parent);
642
643 sock_hold(sk);
644 spin_lock_irqsave(&par->accept_q_lock, flags);
645 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
646 spin_unlock_irqrestore(&par->accept_q_lock, flags);
647 iucv_sk(sk)->parent = parent;
648 sk_acceptq_added(parent);
649 }
650
651 void iucv_accept_unlink(struct sock *sk)
652 {
653 unsigned long flags;
654 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
655
656 spin_lock_irqsave(&par->accept_q_lock, flags);
657 list_del_init(&iucv_sk(sk)->accept_q);
658 spin_unlock_irqrestore(&par->accept_q_lock, flags);
659 sk_acceptq_removed(iucv_sk(sk)->parent);
660 iucv_sk(sk)->parent = NULL;
661 sock_put(sk);
662 }
663
664 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
665 {
666 struct iucv_sock *isk, *n;
667 struct sock *sk;
668
669 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
670 sk = (struct sock *) isk;
671 lock_sock(sk);
672
673 if (sk->sk_state == IUCV_CLOSED) {
674 iucv_accept_unlink(sk);
675 release_sock(sk);
676 continue;
677 }
678
679 if (sk->sk_state == IUCV_CONNECTED ||
680 sk->sk_state == IUCV_DISCONN ||
681 !newsock) {
682 iucv_accept_unlink(sk);
683 if (newsock)
684 sock_graft(sk, newsock);
685
686 release_sock(sk);
687 return sk;
688 }
689
690 release_sock(sk);
691 }
692 return NULL;
693 }
694
695 static void __iucv_auto_name(struct iucv_sock *iucv)
696 {
697 char name[12];
698
699 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
700 while (__iucv_get_sock_by_name(name)) {
701 sprintf(name, "%08x",
702 atomic_inc_return(&iucv_sk_list.autobind_name));
703 }
704 memcpy(iucv->src_name, name, 8);
705 }
706
707 /* Bind an unbound socket */
708 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
709 int addr_len)
710 {
711 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
712 struct sock *sk = sock->sk;
713 struct iucv_sock *iucv;
714 int err = 0;
715 struct net_device *dev;
716 char uid[9];
717
718 /* Verify the input sockaddr */
719 if (!addr || addr->sa_family != AF_IUCV)
720 return -EINVAL;
721
722 if (addr_len < sizeof(struct sockaddr_iucv))
723 return -EINVAL;
724
725 lock_sock(sk);
726 if (sk->sk_state != IUCV_OPEN) {
727 err = -EBADFD;
728 goto done;
729 }
730
731 write_lock_bh(&iucv_sk_list.lock);
732
733 iucv = iucv_sk(sk);
734 if (__iucv_get_sock_by_name(sa->siucv_name)) {
735 err = -EADDRINUSE;
736 goto done_unlock;
737 }
738 if (iucv->path)
739 goto done_unlock;
740
741 /* Bind the socket */
742 if (pr_iucv)
743 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
744 goto vm_bind; /* VM IUCV transport */
745
746 /* try hiper transport */
747 memcpy(uid, sa->siucv_user_id, sizeof(uid));
748 ASCEBC(uid, 8);
749 rcu_read_lock();
750 for_each_netdev_rcu(&init_net, dev) {
751 if (!memcmp(dev->perm_addr, uid, 8)) {
752 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
753 /* Check for unitialized siucv_name */
754 if (strncmp(sa->siucv_name, " ", 8) == 0)
755 __iucv_auto_name(iucv);
756 else
757 memcpy(iucv->src_name, sa->siucv_name, 8);
758 sk->sk_bound_dev_if = dev->ifindex;
759 iucv->hs_dev = dev;
760 dev_hold(dev);
761 sk->sk_state = IUCV_BOUND;
762 iucv->transport = AF_IUCV_TRANS_HIPER;
763 if (!iucv->msglimit)
764 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
765 rcu_read_unlock();
766 goto done_unlock;
767 }
768 }
769 rcu_read_unlock();
770 vm_bind:
771 if (pr_iucv) {
772 /* use local userid for backward compat */
773 memcpy(iucv->src_name, sa->siucv_name, 8);
774 memcpy(iucv->src_user_id, iucv_userid, 8);
775 sk->sk_state = IUCV_BOUND;
776 iucv->transport = AF_IUCV_TRANS_IUCV;
777 if (!iucv->msglimit)
778 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
779 goto done_unlock;
780 }
781 /* found no dev to bind */
782 err = -ENODEV;
783 done_unlock:
784 /* Release the socket list lock */
785 write_unlock_bh(&iucv_sk_list.lock);
786 done:
787 release_sock(sk);
788 return err;
789 }
790
791 /* Automatically bind an unbound socket */
792 static int iucv_sock_autobind(struct sock *sk)
793 {
794 struct iucv_sock *iucv = iucv_sk(sk);
795 int err = 0;
796
797 if (unlikely(!pr_iucv))
798 return -EPROTO;
799
800 memcpy(iucv->src_user_id, iucv_userid, 8);
801
802 write_lock_bh(&iucv_sk_list.lock);
803 __iucv_auto_name(iucv);
804 write_unlock_bh(&iucv_sk_list.lock);
805
806 if (!iucv->msglimit)
807 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
808
809 return err;
810 }
811
812 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
813 {
814 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
815 struct sock *sk = sock->sk;
816 struct iucv_sock *iucv = iucv_sk(sk);
817 unsigned char user_data[16];
818 int err;
819
820 high_nmcpy(user_data, sa->siucv_name);
821 low_nmcpy(user_data, iucv->src_name);
822 ASCEBC(user_data, sizeof(user_data));
823
824 /* Create path. */
825 iucv->path = iucv_path_alloc(iucv->msglimit,
826 IUCV_IPRMDATA, GFP_KERNEL);
827 if (!iucv->path) {
828 err = -ENOMEM;
829 goto done;
830 }
831 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
832 sa->siucv_user_id, NULL, user_data,
833 sk);
834 if (err) {
835 iucv_path_free(iucv->path);
836 iucv->path = NULL;
837 switch (err) {
838 case 0x0b: /* Target communicator is not logged on */
839 err = -ENETUNREACH;
840 break;
841 case 0x0d: /* Max connections for this guest exceeded */
842 case 0x0e: /* Max connections for target guest exceeded */
843 err = -EAGAIN;
844 break;
845 case 0x0f: /* Missing IUCV authorization */
846 err = -EACCES;
847 break;
848 default:
849 err = -ECONNREFUSED;
850 break;
851 }
852 }
853 done:
854 return err;
855 }
856
857 /* Connect an unconnected socket */
858 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
859 int alen, int flags)
860 {
861 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
862 struct sock *sk = sock->sk;
863 struct iucv_sock *iucv = iucv_sk(sk);
864 int err;
865
866 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
867 return -EINVAL;
868
869 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
870 return -EBADFD;
871
872 if (sk->sk_state == IUCV_OPEN &&
873 iucv->transport == AF_IUCV_TRANS_HIPER)
874 return -EBADFD; /* explicit bind required */
875
876 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
877 return -EINVAL;
878
879 if (sk->sk_state == IUCV_OPEN) {
880 err = iucv_sock_autobind(sk);
881 if (unlikely(err))
882 return err;
883 }
884
885 lock_sock(sk);
886
887 /* Set the destination information */
888 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
889 memcpy(iucv->dst_name, sa->siucv_name, 8);
890
891 if (iucv->transport == AF_IUCV_TRANS_HIPER)
892 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
893 else
894 err = afiucv_path_connect(sock, addr);
895 if (err)
896 goto done;
897
898 if (sk->sk_state != IUCV_CONNECTED)
899 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
900 IUCV_DISCONN),
901 sock_sndtimeo(sk, flags & O_NONBLOCK));
902
903 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
904 err = -ECONNREFUSED;
905
906 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
907 iucv_sever_path(sk, 0);
908
909 done:
910 release_sock(sk);
911 return err;
912 }
913
914 /* Move a socket into listening state. */
915 static int iucv_sock_listen(struct socket *sock, int backlog)
916 {
917 struct sock *sk = sock->sk;
918 int err;
919
920 lock_sock(sk);
921
922 err = -EINVAL;
923 if (sk->sk_state != IUCV_BOUND)
924 goto done;
925
926 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
927 goto done;
928
929 sk->sk_max_ack_backlog = backlog;
930 sk->sk_ack_backlog = 0;
931 sk->sk_state = IUCV_LISTEN;
932 err = 0;
933
934 done:
935 release_sock(sk);
936 return err;
937 }
938
939 /* Accept a pending connection */
940 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
941 int flags)
942 {
943 DECLARE_WAITQUEUE(wait, current);
944 struct sock *sk = sock->sk, *nsk;
945 long timeo;
946 int err = 0;
947
948 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
949
950 if (sk->sk_state != IUCV_LISTEN) {
951 err = -EBADFD;
952 goto done;
953 }
954
955 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
956
957 /* Wait for an incoming connection */
958 add_wait_queue_exclusive(sk_sleep(sk), &wait);
959 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
960 set_current_state(TASK_INTERRUPTIBLE);
961 if (!timeo) {
962 err = -EAGAIN;
963 break;
964 }
965
966 release_sock(sk);
967 timeo = schedule_timeout(timeo);
968 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
969
970 if (sk->sk_state != IUCV_LISTEN) {
971 err = -EBADFD;
972 break;
973 }
974
975 if (signal_pending(current)) {
976 err = sock_intr_errno(timeo);
977 break;
978 }
979 }
980
981 set_current_state(TASK_RUNNING);
982 remove_wait_queue(sk_sleep(sk), &wait);
983
984 if (err)
985 goto done;
986
987 newsock->state = SS_CONNECTED;
988
989 done:
990 release_sock(sk);
991 return err;
992 }
993
994 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
995 int *len, int peer)
996 {
997 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
998 struct sock *sk = sock->sk;
999 struct iucv_sock *iucv = iucv_sk(sk);
1000
1001 addr->sa_family = AF_IUCV;
1002 *len = sizeof(struct sockaddr_iucv);
1003
1004 if (peer) {
1005 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1006 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1007 } else {
1008 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1009 memcpy(siucv->siucv_name, iucv->src_name, 8);
1010 }
1011 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1012 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1013 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1014
1015 return 0;
1016 }
1017
1018 /**
1019 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1020 * @path: IUCV path
1021 * @msg: Pointer to a struct iucv_message
1022 * @skb: The socket data to send, skb->len MUST BE <= 7
1023 *
1024 * Send the socket data in the parameter list in the iucv message
1025 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1026 * list and the socket data len at index 7 (last byte).
1027 * See also iucv_msg_length().
1028 *
1029 * Returns the error code from the iucv_message_send() call.
1030 */
1031 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1032 struct sk_buff *skb)
1033 {
1034 u8 prmdata[8];
1035
1036 memcpy(prmdata, (void *) skb->data, skb->len);
1037 prmdata[7] = 0xff - (u8) skb->len;
1038 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1039 (void *) prmdata, 8);
1040 }
1041
1042 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1043 size_t len)
1044 {
1045 struct sock *sk = sock->sk;
1046 struct iucv_sock *iucv = iucv_sk(sk);
1047 size_t headroom = 0;
1048 size_t linear;
1049 struct sk_buff *skb;
1050 struct iucv_message txmsg = {0};
1051 struct cmsghdr *cmsg;
1052 int cmsg_done;
1053 long timeo;
1054 char user_id[9];
1055 char appl_id[9];
1056 int err;
1057 int noblock = msg->msg_flags & MSG_DONTWAIT;
1058
1059 err = sock_error(sk);
1060 if (err)
1061 return err;
1062
1063 if (msg->msg_flags & MSG_OOB)
1064 return -EOPNOTSUPP;
1065
1066 /* SOCK_SEQPACKET: we do not support segmented records */
1067 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1068 return -EOPNOTSUPP;
1069
1070 lock_sock(sk);
1071
1072 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1073 err = -EPIPE;
1074 goto out;
1075 }
1076
1077 /* Return if the socket is not in connected state */
1078 if (sk->sk_state != IUCV_CONNECTED) {
1079 err = -ENOTCONN;
1080 goto out;
1081 }
1082
1083 /* initialize defaults */
1084 cmsg_done = 0; /* check for duplicate headers */
1085 txmsg.class = 0;
1086
1087 /* iterate over control messages */
1088 for_each_cmsghdr(cmsg, msg) {
1089 if (!CMSG_OK(msg, cmsg)) {
1090 err = -EINVAL;
1091 goto out;
1092 }
1093
1094 if (cmsg->cmsg_level != SOL_IUCV)
1095 continue;
1096
1097 if (cmsg->cmsg_type & cmsg_done) {
1098 err = -EINVAL;
1099 goto out;
1100 }
1101 cmsg_done |= cmsg->cmsg_type;
1102
1103 switch (cmsg->cmsg_type) {
1104 case SCM_IUCV_TRGCLS:
1105 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1106 err = -EINVAL;
1107 goto out;
1108 }
1109
1110 /* set iucv message target class */
1111 memcpy(&txmsg.class,
1112 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1113
1114 break;
1115
1116 default:
1117 err = -EINVAL;
1118 goto out;
1119 }
1120 }
1121
1122 /* allocate one skb for each iucv message:
1123 * this is fine for SOCK_SEQPACKET (unless we want to support
1124 * segmented records using the MSG_EOR flag), but
1125 * for SOCK_STREAM we might want to improve it in future */
1126 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1127 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
1128 linear = len;
1129 } else {
1130 if (len < PAGE_SIZE) {
1131 linear = len;
1132 } else {
1133 /* In nonlinear "classic" iucv skb,
1134 * reserve space for iucv_array
1135 */
1136 headroom = sizeof(struct iucv_array) *
1137 (MAX_SKB_FRAGS + 1);
1138 linear = PAGE_SIZE - headroom;
1139 }
1140 }
1141 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1142 noblock, &err, 0);
1143 if (!skb)
1144 goto out;
1145 if (headroom)
1146 skb_reserve(skb, headroom);
1147 skb_put(skb, linear);
1148 skb->len = len;
1149 skb->data_len = len - linear;
1150 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1151 if (err)
1152 goto fail;
1153
1154 /* wait if outstanding messages for iucv path has reached */
1155 timeo = sock_sndtimeo(sk, noblock);
1156 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1157 if (err)
1158 goto fail;
1159
1160 /* return -ECONNRESET if the socket is no longer connected */
1161 if (sk->sk_state != IUCV_CONNECTED) {
1162 err = -ECONNRESET;
1163 goto fail;
1164 }
1165
1166 /* increment and save iucv message tag for msg_completion cbk */
1167 txmsg.tag = iucv->send_tag++;
1168 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1169
1170 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1171 atomic_inc(&iucv->msg_sent);
1172 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1173 if (err) {
1174 atomic_dec(&iucv->msg_sent);
1175 goto fail;
1176 }
1177 } else { /* Classic VM IUCV transport */
1178 skb_queue_tail(&iucv->send_skb_q, skb);
1179
1180 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1181 skb->len <= 7) {
1182 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1183
1184 /* on success: there is no message_complete callback */
1185 /* for an IPRMDATA msg; remove skb from send queue */
1186 if (err == 0) {
1187 skb_unlink(skb, &iucv->send_skb_q);
1188 kfree_skb(skb);
1189 }
1190
1191 /* this error should never happen since the */
1192 /* IUCV_IPRMDATA path flag is set... sever path */
1193 if (err == 0x15) {
1194 pr_iucv->path_sever(iucv->path, NULL);
1195 skb_unlink(skb, &iucv->send_skb_q);
1196 err = -EPIPE;
1197 goto fail;
1198 }
1199 } else if (skb_is_nonlinear(skb)) {
1200 struct iucv_array *iba = (struct iucv_array *)skb->head;
1201 int i;
1202
1203 /* skip iucv_array lying in the headroom */
1204 iba[0].address = (u32)(addr_t)skb->data;
1205 iba[0].length = (u32)skb_headlen(skb);
1206 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1207 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1208
1209 iba[i + 1].address =
1210 (u32)(addr_t)skb_frag_address(frag);
1211 iba[i + 1].length = (u32)skb_frag_size(frag);
1212 }
1213 err = pr_iucv->message_send(iucv->path, &txmsg,
1214 IUCV_IPBUFLST, 0,
1215 (void *)iba, skb->len);
1216 } else { /* non-IPRM Linear skb */
1217 err = pr_iucv->message_send(iucv->path, &txmsg,
1218 0, 0, (void *)skb->data, skb->len);
1219 }
1220 if (err) {
1221 if (err == 3) {
1222 user_id[8] = 0;
1223 memcpy(user_id, iucv->dst_user_id, 8);
1224 appl_id[8] = 0;
1225 memcpy(appl_id, iucv->dst_name, 8);
1226 pr_err(
1227 "Application %s on z/VM guest %s exceeds message limit\n",
1228 appl_id, user_id);
1229 err = -EAGAIN;
1230 } else {
1231 err = -EPIPE;
1232 }
1233 skb_unlink(skb, &iucv->send_skb_q);
1234 goto fail;
1235 }
1236 }
1237
1238 release_sock(sk);
1239 return len;
1240
1241 fail:
1242 kfree_skb(skb);
1243 out:
1244 release_sock(sk);
1245 return err;
1246 }
1247
1248 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1249 {
1250 size_t headroom, linear;
1251 struct sk_buff *skb;
1252 int err;
1253
1254 if (len < PAGE_SIZE) {
1255 headroom = 0;
1256 linear = len;
1257 } else {
1258 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1259 linear = PAGE_SIZE - headroom;
1260 }
1261 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1262 0, &err, GFP_ATOMIC | GFP_DMA);
1263 WARN_ONCE(!skb,
1264 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1265 len, err);
1266 if (skb) {
1267 if (headroom)
1268 skb_reserve(skb, headroom);
1269 skb_put(skb, linear);
1270 skb->len = len;
1271 skb->data_len = len - linear;
1272 }
1273 return skb;
1274 }
1275
1276 /* iucv_process_message() - Receive a single outstanding IUCV message
1277 *
1278 * Locking: must be called with message_q.lock held
1279 */
1280 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1281 struct iucv_path *path,
1282 struct iucv_message *msg)
1283 {
1284 int rc;
1285 unsigned int len;
1286
1287 len = iucv_msg_length(msg);
1288
1289 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1290 /* Note: the first 4 bytes are reserved for msg tag */
1291 IUCV_SKB_CB(skb)->class = msg->class;
1292
1293 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1294 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1295 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1296 skb->data = NULL;
1297 skb->len = 0;
1298 }
1299 } else {
1300 if (skb_is_nonlinear(skb)) {
1301 struct iucv_array *iba = (struct iucv_array *)skb->head;
1302 int i;
1303
1304 iba[0].address = (u32)(addr_t)skb->data;
1305 iba[0].length = (u32)skb_headlen(skb);
1306 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1307 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1308
1309 iba[i + 1].address =
1310 (u32)(addr_t)skb_frag_address(frag);
1311 iba[i + 1].length = (u32)skb_frag_size(frag);
1312 }
1313 rc = pr_iucv->message_receive(path, msg,
1314 IUCV_IPBUFLST,
1315 (void *)iba, len, NULL);
1316 } else {
1317 rc = pr_iucv->message_receive(path, msg,
1318 msg->flags & IUCV_IPRMDATA,
1319 skb->data, len, NULL);
1320 }
1321 if (rc) {
1322 kfree_skb(skb);
1323 return;
1324 }
1325 WARN_ON_ONCE(skb->len != len);
1326 }
1327
1328 IUCV_SKB_CB(skb)->offset = 0;
1329 if (sk_filter(sk, skb)) {
1330 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1331 kfree_skb(skb);
1332 return;
1333 }
1334 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1335 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1336 }
1337
1338 /* iucv_process_message_q() - Process outstanding IUCV messages
1339 *
1340 * Locking: must be called with message_q.lock held
1341 */
1342 static void iucv_process_message_q(struct sock *sk)
1343 {
1344 struct iucv_sock *iucv = iucv_sk(sk);
1345 struct sk_buff *skb;
1346 struct sock_msg_q *p, *n;
1347
1348 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1349 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1350 if (!skb)
1351 break;
1352 iucv_process_message(sk, skb, p->path, &p->msg);
1353 list_del(&p->list);
1354 kfree(p);
1355 if (!skb_queue_empty(&iucv->backlog_skb_q))
1356 break;
1357 }
1358 }
1359
1360 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1361 size_t len, int flags)
1362 {
1363 int noblock = flags & MSG_DONTWAIT;
1364 struct sock *sk = sock->sk;
1365 struct iucv_sock *iucv = iucv_sk(sk);
1366 unsigned int copied, rlen;
1367 struct sk_buff *skb, *rskb, *cskb;
1368 int err = 0;
1369 u32 offset;
1370
1371 if ((sk->sk_state == IUCV_DISCONN) &&
1372 skb_queue_empty(&iucv->backlog_skb_q) &&
1373 skb_queue_empty(&sk->sk_receive_queue) &&
1374 list_empty(&iucv->message_q.list))
1375 return 0;
1376
1377 if (flags & (MSG_OOB))
1378 return -EOPNOTSUPP;
1379
1380 /* receive/dequeue next skb:
1381 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1382 skb = skb_recv_datagram(sk, flags, noblock, &err);
1383 if (!skb) {
1384 if (sk->sk_shutdown & RCV_SHUTDOWN)
1385 return 0;
1386 return err;
1387 }
1388
1389 offset = IUCV_SKB_CB(skb)->offset;
1390 rlen = skb->len - offset; /* real length of skb */
1391 copied = min_t(unsigned int, rlen, len);
1392 if (!rlen)
1393 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1394
1395 cskb = skb;
1396 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1397 if (!(flags & MSG_PEEK))
1398 skb_queue_head(&sk->sk_receive_queue, skb);
1399 return -EFAULT;
1400 }
1401
1402 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1403 if (sk->sk_type == SOCK_SEQPACKET) {
1404 if (copied < rlen)
1405 msg->msg_flags |= MSG_TRUNC;
1406 /* each iucv message contains a complete record */
1407 msg->msg_flags |= MSG_EOR;
1408 }
1409
1410 /* create control message to store iucv msg target class:
1411 * get the trgcls from the control buffer of the skb due to
1412 * fragmentation of original iucv message. */
1413 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1414 sizeof(IUCV_SKB_CB(skb)->class),
1415 (void *)&IUCV_SKB_CB(skb)->class);
1416 if (err) {
1417 if (!(flags & MSG_PEEK))
1418 skb_queue_head(&sk->sk_receive_queue, skb);
1419 return err;
1420 }
1421
1422 /* Mark read part of skb as used */
1423 if (!(flags & MSG_PEEK)) {
1424
1425 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1426 if (sk->sk_type == SOCK_STREAM) {
1427 if (copied < rlen) {
1428 IUCV_SKB_CB(skb)->offset = offset + copied;
1429 skb_queue_head(&sk->sk_receive_queue, skb);
1430 goto done;
1431 }
1432 }
1433
1434 kfree_skb(skb);
1435 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1436 atomic_inc(&iucv->msg_recv);
1437 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1438 WARN_ON(1);
1439 iucv_sock_close(sk);
1440 return -EFAULT;
1441 }
1442 }
1443
1444 /* Queue backlog skbs */
1445 spin_lock_bh(&iucv->message_q.lock);
1446 rskb = skb_dequeue(&iucv->backlog_skb_q);
1447 while (rskb) {
1448 IUCV_SKB_CB(rskb)->offset = 0;
1449 if (__sock_queue_rcv_skb(sk, rskb)) {
1450 /* handle rcv queue full */
1451 skb_queue_head(&iucv->backlog_skb_q,
1452 rskb);
1453 break;
1454 }
1455 rskb = skb_dequeue(&iucv->backlog_skb_q);
1456 }
1457 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1458 if (!list_empty(&iucv->message_q.list))
1459 iucv_process_message_q(sk);
1460 if (atomic_read(&iucv->msg_recv) >=
1461 iucv->msglimit / 2) {
1462 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1463 if (err) {
1464 sk->sk_state = IUCV_DISCONN;
1465 sk->sk_state_change(sk);
1466 }
1467 }
1468 }
1469 spin_unlock_bh(&iucv->message_q.lock);
1470 }
1471
1472 done:
1473 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1474 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1475 copied = rlen;
1476
1477 return copied;
1478 }
1479
1480 static inline unsigned int iucv_accept_poll(struct sock *parent)
1481 {
1482 struct iucv_sock *isk, *n;
1483 struct sock *sk;
1484
1485 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1486 sk = (struct sock *) isk;
1487
1488 if (sk->sk_state == IUCV_CONNECTED)
1489 return POLLIN | POLLRDNORM;
1490 }
1491
1492 return 0;
1493 }
1494
1495 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1496 poll_table *wait)
1497 {
1498 struct sock *sk = sock->sk;
1499 unsigned int mask = 0;
1500
1501 sock_poll_wait(file, sk_sleep(sk), wait);
1502
1503 if (sk->sk_state == IUCV_LISTEN)
1504 return iucv_accept_poll(sk);
1505
1506 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1507 mask |= POLLERR |
1508 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1509
1510 if (sk->sk_shutdown & RCV_SHUTDOWN)
1511 mask |= POLLRDHUP;
1512
1513 if (sk->sk_shutdown == SHUTDOWN_MASK)
1514 mask |= POLLHUP;
1515
1516 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1517 (sk->sk_shutdown & RCV_SHUTDOWN))
1518 mask |= POLLIN | POLLRDNORM;
1519
1520 if (sk->sk_state == IUCV_CLOSED)
1521 mask |= POLLHUP;
1522
1523 if (sk->sk_state == IUCV_DISCONN)
1524 mask |= POLLIN;
1525
1526 if (sock_writeable(sk) && iucv_below_msglim(sk))
1527 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1528 else
1529 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1530
1531 return mask;
1532 }
1533
1534 static int iucv_sock_shutdown(struct socket *sock, int how)
1535 {
1536 struct sock *sk = sock->sk;
1537 struct iucv_sock *iucv = iucv_sk(sk);
1538 struct iucv_message txmsg;
1539 int err = 0;
1540
1541 how++;
1542
1543 if ((how & ~SHUTDOWN_MASK) || !how)
1544 return -EINVAL;
1545
1546 lock_sock(sk);
1547 switch (sk->sk_state) {
1548 case IUCV_LISTEN:
1549 case IUCV_DISCONN:
1550 case IUCV_CLOSING:
1551 case IUCV_CLOSED:
1552 err = -ENOTCONN;
1553 goto fail;
1554 default:
1555 break;
1556 }
1557
1558 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1559 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1560 txmsg.class = 0;
1561 txmsg.tag = 0;
1562 err = pr_iucv->message_send(iucv->path, &txmsg,
1563 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1564 if (err) {
1565 switch (err) {
1566 case 1:
1567 err = -ENOTCONN;
1568 break;
1569 case 2:
1570 err = -ECONNRESET;
1571 break;
1572 default:
1573 err = -ENOTCONN;
1574 break;
1575 }
1576 }
1577 } else
1578 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1579 }
1580
1581 sk->sk_shutdown |= how;
1582 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1583 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1584 iucv->path) {
1585 err = pr_iucv->path_quiesce(iucv->path, NULL);
1586 if (err)
1587 err = -ENOTCONN;
1588 /* skb_queue_purge(&sk->sk_receive_queue); */
1589 }
1590 skb_queue_purge(&sk->sk_receive_queue);
1591 }
1592
1593 /* Wake up anyone sleeping in poll */
1594 sk->sk_state_change(sk);
1595
1596 fail:
1597 release_sock(sk);
1598 return err;
1599 }
1600
1601 static int iucv_sock_release(struct socket *sock)
1602 {
1603 struct sock *sk = sock->sk;
1604 int err = 0;
1605
1606 if (!sk)
1607 return 0;
1608
1609 iucv_sock_close(sk);
1610
1611 sock_orphan(sk);
1612 iucv_sock_kill(sk);
1613 return err;
1614 }
1615
1616 /* getsockopt and setsockopt */
1617 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1618 char __user *optval, unsigned int optlen)
1619 {
1620 struct sock *sk = sock->sk;
1621 struct iucv_sock *iucv = iucv_sk(sk);
1622 int val;
1623 int rc;
1624
1625 if (level != SOL_IUCV)
1626 return -ENOPROTOOPT;
1627
1628 if (optlen < sizeof(int))
1629 return -EINVAL;
1630
1631 if (get_user(val, (int __user *) optval))
1632 return -EFAULT;
1633
1634 rc = 0;
1635
1636 lock_sock(sk);
1637 switch (optname) {
1638 case SO_IPRMDATA_MSG:
1639 if (val)
1640 iucv->flags |= IUCV_IPRMDATA;
1641 else
1642 iucv->flags &= ~IUCV_IPRMDATA;
1643 break;
1644 case SO_MSGLIMIT:
1645 switch (sk->sk_state) {
1646 case IUCV_OPEN:
1647 case IUCV_BOUND:
1648 if (val < 1 || val > (u16)(~0))
1649 rc = -EINVAL;
1650 else
1651 iucv->msglimit = val;
1652 break;
1653 default:
1654 rc = -EINVAL;
1655 break;
1656 }
1657 break;
1658 default:
1659 rc = -ENOPROTOOPT;
1660 break;
1661 }
1662 release_sock(sk);
1663
1664 return rc;
1665 }
1666
1667 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1668 char __user *optval, int __user *optlen)
1669 {
1670 struct sock *sk = sock->sk;
1671 struct iucv_sock *iucv = iucv_sk(sk);
1672 unsigned int val;
1673 int len;
1674
1675 if (level != SOL_IUCV)
1676 return -ENOPROTOOPT;
1677
1678 if (get_user(len, optlen))
1679 return -EFAULT;
1680
1681 if (len < 0)
1682 return -EINVAL;
1683
1684 len = min_t(unsigned int, len, sizeof(int));
1685
1686 switch (optname) {
1687 case SO_IPRMDATA_MSG:
1688 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1689 break;
1690 case SO_MSGLIMIT:
1691 lock_sock(sk);
1692 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1693 : iucv->msglimit; /* default */
1694 release_sock(sk);
1695 break;
1696 case SO_MSGSIZE:
1697 if (sk->sk_state == IUCV_OPEN)
1698 return -EBADFD;
1699 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1700 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1701 0x7fffffff;
1702 break;
1703 default:
1704 return -ENOPROTOOPT;
1705 }
1706
1707 if (put_user(len, optlen))
1708 return -EFAULT;
1709 if (copy_to_user(optval, &val, len))
1710 return -EFAULT;
1711
1712 return 0;
1713 }
1714
1715
1716 /* Callback wrappers - called from iucv base support */
1717 static int iucv_callback_connreq(struct iucv_path *path,
1718 u8 ipvmid[8], u8 ipuser[16])
1719 {
1720 unsigned char user_data[16];
1721 unsigned char nuser_data[16];
1722 unsigned char src_name[8];
1723 struct sock *sk, *nsk;
1724 struct iucv_sock *iucv, *niucv;
1725 int err;
1726
1727 memcpy(src_name, ipuser, 8);
1728 EBCASC(src_name, 8);
1729 /* Find out if this path belongs to af_iucv. */
1730 read_lock(&iucv_sk_list.lock);
1731 iucv = NULL;
1732 sk = NULL;
1733 sk_for_each(sk, &iucv_sk_list.head)
1734 if (sk->sk_state == IUCV_LISTEN &&
1735 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1736 /*
1737 * Found a listening socket with
1738 * src_name == ipuser[0-7].
1739 */
1740 iucv = iucv_sk(sk);
1741 break;
1742 }
1743 read_unlock(&iucv_sk_list.lock);
1744 if (!iucv)
1745 /* No socket found, not one of our paths. */
1746 return -EINVAL;
1747
1748 bh_lock_sock(sk);
1749
1750 /* Check if parent socket is listening */
1751 low_nmcpy(user_data, iucv->src_name);
1752 high_nmcpy(user_data, iucv->dst_name);
1753 ASCEBC(user_data, sizeof(user_data));
1754 if (sk->sk_state != IUCV_LISTEN) {
1755 err = pr_iucv->path_sever(path, user_data);
1756 iucv_path_free(path);
1757 goto fail;
1758 }
1759
1760 /* Check for backlog size */
1761 if (sk_acceptq_is_full(sk)) {
1762 err = pr_iucv->path_sever(path, user_data);
1763 iucv_path_free(path);
1764 goto fail;
1765 }
1766
1767 /* Create the new socket */
1768 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1769 if (!nsk) {
1770 err = pr_iucv->path_sever(path, user_data);
1771 iucv_path_free(path);
1772 goto fail;
1773 }
1774
1775 niucv = iucv_sk(nsk);
1776 iucv_sock_init(nsk, sk);
1777
1778 /* Set the new iucv_sock */
1779 memcpy(niucv->dst_name, ipuser + 8, 8);
1780 EBCASC(niucv->dst_name, 8);
1781 memcpy(niucv->dst_user_id, ipvmid, 8);
1782 memcpy(niucv->src_name, iucv->src_name, 8);
1783 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1784 niucv->path = path;
1785
1786 /* Call iucv_accept */
1787 high_nmcpy(nuser_data, ipuser + 8);
1788 memcpy(nuser_data + 8, niucv->src_name, 8);
1789 ASCEBC(nuser_data + 8, 8);
1790
1791 /* set message limit for path based on msglimit of accepting socket */
1792 niucv->msglimit = iucv->msglimit;
1793 path->msglim = iucv->msglimit;
1794 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1795 if (err) {
1796 iucv_sever_path(nsk, 1);
1797 iucv_sock_kill(nsk);
1798 goto fail;
1799 }
1800
1801 iucv_accept_enqueue(sk, nsk);
1802
1803 /* Wake up accept */
1804 nsk->sk_state = IUCV_CONNECTED;
1805 sk->sk_data_ready(sk);
1806 err = 0;
1807 fail:
1808 bh_unlock_sock(sk);
1809 return 0;
1810 }
1811
1812 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1813 {
1814 struct sock *sk = path->private;
1815
1816 sk->sk_state = IUCV_CONNECTED;
1817 sk->sk_state_change(sk);
1818 }
1819
1820 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1821 {
1822 struct sock *sk = path->private;
1823 struct iucv_sock *iucv = iucv_sk(sk);
1824 struct sk_buff *skb;
1825 struct sock_msg_q *save_msg;
1826 int len;
1827
1828 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1829 pr_iucv->message_reject(path, msg);
1830 return;
1831 }
1832
1833 spin_lock(&iucv->message_q.lock);
1834
1835 if (!list_empty(&iucv->message_q.list) ||
1836 !skb_queue_empty(&iucv->backlog_skb_q))
1837 goto save_message;
1838
1839 len = atomic_read(&sk->sk_rmem_alloc);
1840 len += SKB_TRUESIZE(iucv_msg_length(msg));
1841 if (len > sk->sk_rcvbuf)
1842 goto save_message;
1843
1844 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1845 if (!skb)
1846 goto save_message;
1847
1848 iucv_process_message(sk, skb, path, msg);
1849 goto out_unlock;
1850
1851 save_message:
1852 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1853 if (!save_msg)
1854 goto out_unlock;
1855 save_msg->path = path;
1856 save_msg->msg = *msg;
1857
1858 list_add_tail(&save_msg->list, &iucv->message_q.list);
1859
1860 out_unlock:
1861 spin_unlock(&iucv->message_q.lock);
1862 }
1863
1864 static void iucv_callback_txdone(struct iucv_path *path,
1865 struct iucv_message *msg)
1866 {
1867 struct sock *sk = path->private;
1868 struct sk_buff *this = NULL;
1869 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1870 struct sk_buff *list_skb = list->next;
1871 unsigned long flags;
1872
1873 bh_lock_sock(sk);
1874 if (!skb_queue_empty(list)) {
1875 spin_lock_irqsave(&list->lock, flags);
1876
1877 while (list_skb != (struct sk_buff *)list) {
1878 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1879 this = list_skb;
1880 break;
1881 }
1882 list_skb = list_skb->next;
1883 }
1884 if (this)
1885 __skb_unlink(this, list);
1886
1887 spin_unlock_irqrestore(&list->lock, flags);
1888
1889 if (this) {
1890 kfree_skb(this);
1891 /* wake up any process waiting for sending */
1892 iucv_sock_wake_msglim(sk);
1893 }
1894 }
1895
1896 if (sk->sk_state == IUCV_CLOSING) {
1897 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1898 sk->sk_state = IUCV_CLOSED;
1899 sk->sk_state_change(sk);
1900 }
1901 }
1902 bh_unlock_sock(sk);
1903
1904 }
1905
1906 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1907 {
1908 struct sock *sk = path->private;
1909
1910 if (sk->sk_state == IUCV_CLOSED)
1911 return;
1912
1913 bh_lock_sock(sk);
1914 iucv_sever_path(sk, 1);
1915 sk->sk_state = IUCV_DISCONN;
1916
1917 sk->sk_state_change(sk);
1918 bh_unlock_sock(sk);
1919 }
1920
1921 /* called if the other communication side shuts down its RECV direction;
1922 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1923 */
1924 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1925 {
1926 struct sock *sk = path->private;
1927
1928 bh_lock_sock(sk);
1929 if (sk->sk_state != IUCV_CLOSED) {
1930 sk->sk_shutdown |= SEND_SHUTDOWN;
1931 sk->sk_state_change(sk);
1932 }
1933 bh_unlock_sock(sk);
1934 }
1935
1936 /***************** HiperSockets transport callbacks ********************/
1937 static void afiucv_swap_src_dest(struct sk_buff *skb)
1938 {
1939 struct af_iucv_trans_hdr *trans_hdr =
1940 (struct af_iucv_trans_hdr *)skb->data;
1941 char tmpID[8];
1942 char tmpName[8];
1943
1944 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1945 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1946 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1947 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1948 memcpy(tmpID, trans_hdr->srcUserID, 8);
1949 memcpy(tmpName, trans_hdr->srcAppName, 8);
1950 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1951 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1952 memcpy(trans_hdr->destUserID, tmpID, 8);
1953 memcpy(trans_hdr->destAppName, tmpName, 8);
1954 skb_push(skb, ETH_HLEN);
1955 memset(skb->data, 0, ETH_HLEN);
1956 }
1957
1958 /**
1959 * afiucv_hs_callback_syn - react on received SYN
1960 **/
1961 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1962 {
1963 struct sock *nsk;
1964 struct iucv_sock *iucv, *niucv;
1965 struct af_iucv_trans_hdr *trans_hdr;
1966 int err;
1967
1968 iucv = iucv_sk(sk);
1969 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1970 if (!iucv) {
1971 /* no sock - connection refused */
1972 afiucv_swap_src_dest(skb);
1973 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1974 err = dev_queue_xmit(skb);
1975 goto out;
1976 }
1977
1978 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1979 bh_lock_sock(sk);
1980 if ((sk->sk_state != IUCV_LISTEN) ||
1981 sk_acceptq_is_full(sk) ||
1982 !nsk) {
1983 /* error on server socket - connection refused */
1984 afiucv_swap_src_dest(skb);
1985 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1986 err = dev_queue_xmit(skb);
1987 iucv_sock_kill(nsk);
1988 bh_unlock_sock(sk);
1989 goto out;
1990 }
1991
1992 niucv = iucv_sk(nsk);
1993 iucv_sock_init(nsk, sk);
1994 niucv->transport = AF_IUCV_TRANS_HIPER;
1995 niucv->msglimit = iucv->msglimit;
1996 if (!trans_hdr->window)
1997 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1998 else
1999 niucv->msglimit_peer = trans_hdr->window;
2000 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
2001 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
2002 memcpy(niucv->src_name, iucv->src_name, 8);
2003 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2004 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
2005 niucv->hs_dev = iucv->hs_dev;
2006 dev_hold(niucv->hs_dev);
2007 afiucv_swap_src_dest(skb);
2008 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2009 trans_hdr->window = niucv->msglimit;
2010 /* if receiver acks the xmit connection is established */
2011 err = dev_queue_xmit(skb);
2012 if (!err) {
2013 iucv_accept_enqueue(sk, nsk);
2014 nsk->sk_state = IUCV_CONNECTED;
2015 sk->sk_data_ready(sk);
2016 } else
2017 iucv_sock_kill(nsk);
2018 bh_unlock_sock(sk);
2019
2020 out:
2021 return NET_RX_SUCCESS;
2022 }
2023
2024 /**
2025 * afiucv_hs_callback_synack() - react on received SYN-ACK
2026 **/
2027 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2028 {
2029 struct iucv_sock *iucv = iucv_sk(sk);
2030 struct af_iucv_trans_hdr *trans_hdr =
2031 (struct af_iucv_trans_hdr *)skb->data;
2032
2033 if (!iucv)
2034 goto out;
2035 if (sk->sk_state != IUCV_BOUND)
2036 goto out;
2037 bh_lock_sock(sk);
2038 iucv->msglimit_peer = trans_hdr->window;
2039 sk->sk_state = IUCV_CONNECTED;
2040 sk->sk_state_change(sk);
2041 bh_unlock_sock(sk);
2042 out:
2043 kfree_skb(skb);
2044 return NET_RX_SUCCESS;
2045 }
2046
2047 /**
2048 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2049 **/
2050 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2051 {
2052 struct iucv_sock *iucv = iucv_sk(sk);
2053
2054 if (!iucv)
2055 goto out;
2056 if (sk->sk_state != IUCV_BOUND)
2057 goto out;
2058 bh_lock_sock(sk);
2059 sk->sk_state = IUCV_DISCONN;
2060 sk->sk_state_change(sk);
2061 bh_unlock_sock(sk);
2062 out:
2063 kfree_skb(skb);
2064 return NET_RX_SUCCESS;
2065 }
2066
2067 /**
2068 * afiucv_hs_callback_fin() - react on received FIN
2069 **/
2070 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2071 {
2072 struct iucv_sock *iucv = iucv_sk(sk);
2073
2074 /* other end of connection closed */
2075 if (!iucv)
2076 goto out;
2077 bh_lock_sock(sk);
2078 if (sk->sk_state == IUCV_CONNECTED) {
2079 sk->sk_state = IUCV_DISCONN;
2080 sk->sk_state_change(sk);
2081 }
2082 bh_unlock_sock(sk);
2083 out:
2084 kfree_skb(skb);
2085 return NET_RX_SUCCESS;
2086 }
2087
2088 /**
2089 * afiucv_hs_callback_win() - react on received WIN
2090 **/
2091 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2092 {
2093 struct iucv_sock *iucv = iucv_sk(sk);
2094 struct af_iucv_trans_hdr *trans_hdr =
2095 (struct af_iucv_trans_hdr *)skb->data;
2096
2097 if (!iucv)
2098 return NET_RX_SUCCESS;
2099
2100 if (sk->sk_state != IUCV_CONNECTED)
2101 return NET_RX_SUCCESS;
2102
2103 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2104 iucv_sock_wake_msglim(sk);
2105 return NET_RX_SUCCESS;
2106 }
2107
2108 /**
2109 * afiucv_hs_callback_rx() - react on received data
2110 **/
2111 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2112 {
2113 struct iucv_sock *iucv = iucv_sk(sk);
2114
2115 if (!iucv) {
2116 kfree_skb(skb);
2117 return NET_RX_SUCCESS;
2118 }
2119
2120 if (sk->sk_state != IUCV_CONNECTED) {
2121 kfree_skb(skb);
2122 return NET_RX_SUCCESS;
2123 }
2124
2125 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2126 kfree_skb(skb);
2127 return NET_RX_SUCCESS;
2128 }
2129
2130 /* write stuff from iucv_msg to skb cb */
2131 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2132 skb_reset_transport_header(skb);
2133 skb_reset_network_header(skb);
2134 IUCV_SKB_CB(skb)->offset = 0;
2135 if (sk_filter(sk, skb)) {
2136 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2137 kfree_skb(skb);
2138 return NET_RX_SUCCESS;
2139 }
2140
2141 spin_lock(&iucv->message_q.lock);
2142 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2143 if (__sock_queue_rcv_skb(sk, skb))
2144 /* handle rcv queue full */
2145 skb_queue_tail(&iucv->backlog_skb_q, skb);
2146 } else
2147 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2148 spin_unlock(&iucv->message_q.lock);
2149 return NET_RX_SUCCESS;
2150 }
2151
2152 /**
2153 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2154 * transport
2155 * called from netif RX softirq
2156 **/
2157 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2158 struct packet_type *pt, struct net_device *orig_dev)
2159 {
2160 struct sock *sk;
2161 struct iucv_sock *iucv;
2162 struct af_iucv_trans_hdr *trans_hdr;
2163 char nullstring[8];
2164 int err = 0;
2165
2166 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2167 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2168 (int)skb->len,
2169 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2170 kfree_skb(skb);
2171 return NET_RX_SUCCESS;
2172 }
2173 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2174 if (skb_linearize(skb)) {
2175 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2176 (int)skb->len);
2177 kfree_skb(skb);
2178 return NET_RX_SUCCESS;
2179 }
2180 skb_pull(skb, ETH_HLEN);
2181 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2182 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2183 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2184 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2185 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2186 memset(nullstring, 0, sizeof(nullstring));
2187 iucv = NULL;
2188 sk = NULL;
2189 read_lock(&iucv_sk_list.lock);
2190 sk_for_each(sk, &iucv_sk_list.head) {
2191 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2192 if ((!memcmp(&iucv_sk(sk)->src_name,
2193 trans_hdr->destAppName, 8)) &&
2194 (!memcmp(&iucv_sk(sk)->src_user_id,
2195 trans_hdr->destUserID, 8)) &&
2196 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2197 (!memcmp(&iucv_sk(sk)->dst_user_id,
2198 nullstring, 8))) {
2199 iucv = iucv_sk(sk);
2200 break;
2201 }
2202 } else {
2203 if ((!memcmp(&iucv_sk(sk)->src_name,
2204 trans_hdr->destAppName, 8)) &&
2205 (!memcmp(&iucv_sk(sk)->src_user_id,
2206 trans_hdr->destUserID, 8)) &&
2207 (!memcmp(&iucv_sk(sk)->dst_name,
2208 trans_hdr->srcAppName, 8)) &&
2209 (!memcmp(&iucv_sk(sk)->dst_user_id,
2210 trans_hdr->srcUserID, 8))) {
2211 iucv = iucv_sk(sk);
2212 break;
2213 }
2214 }
2215 }
2216 read_unlock(&iucv_sk_list.lock);
2217 if (!iucv)
2218 sk = NULL;
2219
2220 /* no sock
2221 how should we send with no sock
2222 1) send without sock no send rc checking?
2223 2) introduce default sock to handle this cases
2224
2225 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2226 data -> send FIN
2227 SYN|ACK, SYN|FIN, FIN -> no action? */
2228
2229 switch (trans_hdr->flags) {
2230 case AF_IUCV_FLAG_SYN:
2231 /* connect request */
2232 err = afiucv_hs_callback_syn(sk, skb);
2233 break;
2234 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2235 /* connect request confirmed */
2236 err = afiucv_hs_callback_synack(sk, skb);
2237 break;
2238 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2239 /* connect request refused */
2240 err = afiucv_hs_callback_synfin(sk, skb);
2241 break;
2242 case (AF_IUCV_FLAG_FIN):
2243 /* close request */
2244 err = afiucv_hs_callback_fin(sk, skb);
2245 break;
2246 case (AF_IUCV_FLAG_WIN):
2247 err = afiucv_hs_callback_win(sk, skb);
2248 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2249 kfree_skb(skb);
2250 break;
2251 }
2252 /* fall through and receive non-zero length data */
2253 case (AF_IUCV_FLAG_SHT):
2254 /* shutdown request */
2255 /* fall through and receive zero length data */
2256 case 0:
2257 /* plain data frame */
2258 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2259 err = afiucv_hs_callback_rx(sk, skb);
2260 break;
2261 default:
2262 ;
2263 }
2264
2265 return err;
2266 }
2267
2268 /**
2269 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2270 * transport
2271 **/
2272 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2273 enum iucv_tx_notify n)
2274 {
2275 struct sock *isk = skb->sk;
2276 struct sock *sk = NULL;
2277 struct iucv_sock *iucv = NULL;
2278 struct sk_buff_head *list;
2279 struct sk_buff *list_skb;
2280 struct sk_buff *nskb;
2281 unsigned long flags;
2282
2283 read_lock_irqsave(&iucv_sk_list.lock, flags);
2284 sk_for_each(sk, &iucv_sk_list.head)
2285 if (sk == isk) {
2286 iucv = iucv_sk(sk);
2287 break;
2288 }
2289 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2290
2291 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2292 return;
2293
2294 list = &iucv->send_skb_q;
2295 spin_lock_irqsave(&list->lock, flags);
2296 if (skb_queue_empty(list))
2297 goto out_unlock;
2298 list_skb = list->next;
2299 nskb = list_skb->next;
2300 while (list_skb != (struct sk_buff *)list) {
2301 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2302 switch (n) {
2303 case TX_NOTIFY_OK:
2304 __skb_unlink(list_skb, list);
2305 kfree_skb(list_skb);
2306 iucv_sock_wake_msglim(sk);
2307 break;
2308 case TX_NOTIFY_PENDING:
2309 atomic_inc(&iucv->pendings);
2310 break;
2311 case TX_NOTIFY_DELAYED_OK:
2312 __skb_unlink(list_skb, list);
2313 atomic_dec(&iucv->pendings);
2314 if (atomic_read(&iucv->pendings) <= 0)
2315 iucv_sock_wake_msglim(sk);
2316 kfree_skb(list_skb);
2317 break;
2318 case TX_NOTIFY_UNREACHABLE:
2319 case TX_NOTIFY_DELAYED_UNREACHABLE:
2320 case TX_NOTIFY_TPQFULL: /* not yet used */
2321 case TX_NOTIFY_GENERALERROR:
2322 case TX_NOTIFY_DELAYED_GENERALERROR:
2323 __skb_unlink(list_skb, list);
2324 kfree_skb(list_skb);
2325 if (sk->sk_state == IUCV_CONNECTED) {
2326 sk->sk_state = IUCV_DISCONN;
2327 sk->sk_state_change(sk);
2328 }
2329 break;
2330 }
2331 break;
2332 }
2333 list_skb = nskb;
2334 nskb = nskb->next;
2335 }
2336 out_unlock:
2337 spin_unlock_irqrestore(&list->lock, flags);
2338
2339 if (sk->sk_state == IUCV_CLOSING) {
2340 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2341 sk->sk_state = IUCV_CLOSED;
2342 sk->sk_state_change(sk);
2343 }
2344 }
2345
2346 }
2347
2348 /*
2349 * afiucv_netdev_event: handle netdev notifier chain events
2350 */
2351 static int afiucv_netdev_event(struct notifier_block *this,
2352 unsigned long event, void *ptr)
2353 {
2354 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2355 struct sock *sk;
2356 struct iucv_sock *iucv;
2357
2358 switch (event) {
2359 case NETDEV_REBOOT:
2360 case NETDEV_GOING_DOWN:
2361 sk_for_each(sk, &iucv_sk_list.head) {
2362 iucv = iucv_sk(sk);
2363 if ((iucv->hs_dev == event_dev) &&
2364 (sk->sk_state == IUCV_CONNECTED)) {
2365 if (event == NETDEV_GOING_DOWN)
2366 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2367 sk->sk_state = IUCV_DISCONN;
2368 sk->sk_state_change(sk);
2369 }
2370 }
2371 break;
2372 case NETDEV_DOWN:
2373 case NETDEV_UNREGISTER:
2374 default:
2375 break;
2376 }
2377 return NOTIFY_DONE;
2378 }
2379
2380 static struct notifier_block afiucv_netdev_notifier = {
2381 .notifier_call = afiucv_netdev_event,
2382 };
2383
2384 static const struct proto_ops iucv_sock_ops = {
2385 .family = PF_IUCV,
2386 .owner = THIS_MODULE,
2387 .release = iucv_sock_release,
2388 .bind = iucv_sock_bind,
2389 .connect = iucv_sock_connect,
2390 .listen = iucv_sock_listen,
2391 .accept = iucv_sock_accept,
2392 .getname = iucv_sock_getname,
2393 .sendmsg = iucv_sock_sendmsg,
2394 .recvmsg = iucv_sock_recvmsg,
2395 .poll = iucv_sock_poll,
2396 .ioctl = sock_no_ioctl,
2397 .mmap = sock_no_mmap,
2398 .socketpair = sock_no_socketpair,
2399 .shutdown = iucv_sock_shutdown,
2400 .setsockopt = iucv_sock_setsockopt,
2401 .getsockopt = iucv_sock_getsockopt,
2402 };
2403
2404 static const struct net_proto_family iucv_sock_family_ops = {
2405 .family = AF_IUCV,
2406 .owner = THIS_MODULE,
2407 .create = iucv_sock_create,
2408 };
2409
2410 static struct packet_type iucv_packet_type = {
2411 .type = cpu_to_be16(ETH_P_AF_IUCV),
2412 .func = afiucv_hs_rcv,
2413 };
2414
2415 static int afiucv_iucv_init(void)
2416 {
2417 int err;
2418
2419 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2420 if (err)
2421 goto out;
2422 /* establish dummy device */
2423 af_iucv_driver.bus = pr_iucv->bus;
2424 err = driver_register(&af_iucv_driver);
2425 if (err)
2426 goto out_iucv;
2427 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2428 if (!af_iucv_dev) {
2429 err = -ENOMEM;
2430 goto out_driver;
2431 }
2432 dev_set_name(af_iucv_dev, "af_iucv");
2433 af_iucv_dev->bus = pr_iucv->bus;
2434 af_iucv_dev->parent = pr_iucv->root;
2435 af_iucv_dev->release = (void (*)(struct device *))kfree;
2436 af_iucv_dev->driver = &af_iucv_driver;
2437 err = device_register(af_iucv_dev);
2438 if (err)
2439 goto out_driver;
2440 return 0;
2441
2442 out_driver:
2443 driver_unregister(&af_iucv_driver);
2444 out_iucv:
2445 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2446 out:
2447 return err;
2448 }
2449
2450 static int __init afiucv_init(void)
2451 {
2452 int err;
2453
2454 if (MACHINE_IS_VM) {
2455 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2456 if (unlikely(err)) {
2457 WARN_ON(err);
2458 err = -EPROTONOSUPPORT;
2459 goto out;
2460 }
2461
2462 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2463 if (!pr_iucv) {
2464 printk(KERN_WARNING "iucv_if lookup failed\n");
2465 memset(&iucv_userid, 0, sizeof(iucv_userid));
2466 }
2467 } else {
2468 memset(&iucv_userid, 0, sizeof(iucv_userid));
2469 pr_iucv = NULL;
2470 }
2471
2472 err = proto_register(&iucv_proto, 0);
2473 if (err)
2474 goto out;
2475 err = sock_register(&iucv_sock_family_ops);
2476 if (err)
2477 goto out_proto;
2478
2479 if (pr_iucv) {
2480 err = afiucv_iucv_init();
2481 if (err)
2482 goto out_sock;
2483 } else
2484 register_netdevice_notifier(&afiucv_netdev_notifier);
2485 dev_add_pack(&iucv_packet_type);
2486 return 0;
2487
2488 out_sock:
2489 sock_unregister(PF_IUCV);
2490 out_proto:
2491 proto_unregister(&iucv_proto);
2492 out:
2493 if (pr_iucv)
2494 symbol_put(iucv_if);
2495 return err;
2496 }
2497
2498 static void __exit afiucv_exit(void)
2499 {
2500 if (pr_iucv) {
2501 device_unregister(af_iucv_dev);
2502 driver_unregister(&af_iucv_driver);
2503 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2504 symbol_put(iucv_if);
2505 } else
2506 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2507 dev_remove_pack(&iucv_packet_type);
2508 sock_unregister(PF_IUCV);
2509 proto_unregister(&iucv_proto);
2510 }
2511
2512 module_init(afiucv_init);
2513 module_exit(afiucv_exit);
2514
2515 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2516 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2517 MODULE_VERSION(VERSION);
2518 MODULE_LICENSE("GPL");
2519 MODULE_ALIAS_NETPROTO(PF_IUCV);
2520
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